What structure is composed of two layers of fat molecules that are free to flow around one another?
A) the endoplasmic reticulum
B) a ribosome
C) a mitochondrion
D) the membrane
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Q22: The structure that contains a cell's chromosomes
Q24: Chemicals are released by axons _.
A)into the
Q26: Many dendrites contain short outgrowths called spines
Q26: Gaps in the insulating material that surrounds
Q28: Protein channels allow _ molecules to cross
Q30: An axon has many branches, each of
Q31: What do neurons have that other cells
Q31: The tree-like branches of a neuron that
Q34: A presynaptic terminal is also known as
Q34: Nodes of Ranvier are _.
A)gaps in the
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